I have conducted the Dial-out test and it seems that something is wrong.
There appears to be a dial-out taking place (I can hear the DTMF tones) but neither of the two mobile numbers registered to receive calls get called.
I briefly hear a message "Please check the number ..."
When I have had alarms recently (not turning the system off in time when I return home) there has been no call received on the dial-out numbers know to Comfort.

I have Comfort 1 Ultra which has been working OK in this respect for 10 years.